Manufacturer Symbols on the ICs

Sometimes you might read a manufacturer symbol on an Integrated Circuits ( eg. the below picture ) , Here are some of these symbols and their illustration .

AD - Analog Device
AY - General Instrument
CD - RCY
DM - Nantional Semiconductor
HD - Hitachi
I - Intel
MC - Motorola
MJ - Plessey
MK - Mostek
MP - Micro Power System
N - Signetics
RC - Raytheon
SL - Plessey
SN - Texas Instruments
UCN - SpragueX - Xicor
XR - Raytheon
Z - Zilog
ZN - Ferranti
uA - Texas Instruments
uPD - NEC

Source: ETI ELECTRONICS MANUAL - UK
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